P.W. Hawkes – författare

New forms of imaging in science have nearly always led to major advances, especially at the nanoscale, and the pace of these developments has increased dramatically in recent decades. Many new types of microscopes have joined the traditional light microscope and the transmission and scanning electron microscopes during the past two decades. In the present volumes, a group of experts present comprehensive reviews of these new instruments and new versions of the older ones as well as associated techniques and draw attention to their principal areas of application. Numerous subjects are benefiting from these new tools, including semiconductor physics, medicine, molecular biology, the nanoworld in general, magnetism, and ferroelectricity. Science of Microscopy will be an indispensable guide to a wide range of scientists in university laboratories as well as to engineers and scientists in industrial R&D departments.

New forms of imaging in science have nearly always led to major advances, especially at the nanoscale, and the pace of these developments has increased dramatically in recent decades. Many new types of microscopes have joined the traditional light microscope and the transmission and scanning electron microscopes during the past two decades. In the present volumes, a group of experts present comprehensive reviews of these new instruments and new versions of the older ones as well as associated techniques and draw attention to their principal areas of application. Numerous subjects are benefiting from these new tools, including semiconductor physics, medicine, molecular biology, the nanoworld in general, magnetism, and ferroelectricity. Science of Microscopy will be an indispensable guide to a wide range of scientists in university laboratories as well as to engineers and scientists in industrial R&D departments.

No single volume has been entirely devoted to the properties of magnetic lenses, so far as I am aware, although of course all the numerous textbooks on electron optics devote space to them. The absence of such a volume, bringing together in­ formation about the theory and practical design of these lenses, is surprising, for their introduction some fifty years ago has created an entirely new family of commercial instruments, ranging from the now traditional transmission electron microscope, through the reflection and transmission scanning microscopes, to co­ lumns for micromachining and microlithography, not to mention the host of experi­ mental devices not available commercially. It therefore seemed useful to prepare an account of the various aspects of mag­ netic lens studies. These divide naturally into the five chapters of this book: the theoretical background, in which the optical behaviour is described and formu­ lae given for the various aberration coefficients; numerical methods for calculat­ ing the field distribution and trajectory tracing; extensive discussion of the paraxial optical properties and aberration coefficients of practical lenses, il­ lustrated with curves from which numerical information can be obtained; a comple­ mentary account of the practical, engineering aspects of lens design, including permanent magnet lenses and the various types of superconducting lenses; and final­ ly, an up-to-date survey of several kinds of highly unconventional magnetic lens, which may well change the appearance of future electron optical instruments very considerably after they cease to be unconventional.